Question
1
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Find the expression which has a sum nearly equal to 70.
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A
55 + 22
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B
19 + 92
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C
45 + 39
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D
25 + 43
The correct answer is "25 + 43".
Solution:
To find the correct answer, we find the sum of each expression by rounding (up or down) the addends.
At Option A:
Round the addends to the nearest tens and then add.
55 + 22 = ?
↓ ↓
60 + 20 = 80
This expression has a sum nearly equal to 80.
At Option B:
19 + 92 = ?
↓ ↓
20 + 90 = 110
This expression has a sum nearly equal to 110.
At option C:
45 + 39 = ?
↓ ↓
50 + 40 = 90
This expression has a sum nearly equal to 90.
At the last option D:
25 + 43 = ?
↓ ↓
30 + 40 = 70
This expression has a sum nearly equal to 70.
So, the desired answer is "25 + 43".